STRUT (5 letters) The term SHOW OFF YOUR MUSCLES can be summarized by two crossword solutions: FLEX (4 letters) and STRUT (5 letters). FLEX is a verb meaning to bend or move a joint, often used in the context of physical exercise. STRUT is a verb meaning to walk with a proud, confident gait, often used to describe someone who is showing off their body. Together, these two words suggest that SHOW OFF YOUR MUSCLES is an expression used to encourage someone to display their physical strength and fitness.